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Published online 2 June 2005
Published in Soil Sci Soc Am J 69:1066-1068 (2005)
DOI: 10.2136/sssaj2004.0010
© 2005 Soil Science Society of America
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Soil Chemistry Note

A SIMPLE METHOD FOR MEASURING THE CARBONATE CONTENT OF SOILS

Balázs Horvátha,*, Oliver Opara-Nadib and Friedrich Beesea

a Inst. of Soil Sciences and Plant Nutrition, Georg-August Univ. of Göttingen, 2 Büsgenweg, Göttingen, 37077 F.R. Germany
b Faculty of Agriculture & Veterinary Medicine, Abia State Univ., P.M.B. 2000 Uturu, Nigeria

* Corresponding author (bhorvath{at}emk.nyme.hu)

The traditional measurement of the carbonate content of soils with the Scheibler apparatus is slow and labor intensive. Our objective was to develop a relatively simple and accurate method. The pressure calcimeter principle was used; the pressure change caused by the reaction between HCl and a weighed soil sample was measured with a digital plunge-in manometer through a silicone-rubber septum placed on a screw-capped tube. The method was calibrated with pure CaCO3. The correlation between the measured and weighed amounts was excellent (r2 = 0.999). The carbonate content of a natural soil sample was measured 10 times; the coefficient of variation was 1.9%. Ten ISE (International Soil-Analytical Exchange) samples were analyzed with this method which contained a carbonate content of 3 to 170 g kg–1. Satisfactory results were obtained, indicating the suitability of the proposed method for practical purposes.

Abbreviations: ISE, International Soil-Analytical Exchange • MAD, median of the absolute deviation






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